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Finding the Fourth Proportional to 1,687.10, 2,327.60 and 988.47

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Solution

The fourth proportional to 1,687.10, 2,327.60 and 988.47 is: 1,363.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,687.10 : 2,327.60 = 988.47 : x
  2. Step 2: Convert to fraction form
    1,687.10/2,327.60 = 988.47/x
  3. Step 3: Cross multiply
    1,687.10x = 2,327.60 × 988.47
  4. Step 4: Simplify right side
    1,687.10x = 2,300,765.24
  5. Step 5: Solve for x
    x = 2,300,765.24/1,687.10
  6. Step 6: Final answer
    x = 1,363.74

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.